Arctic sea ice variability during the last deglaciation: a biomarker approach
The last transition from full glacial to current interglacial conditions was accompanied by distinct short-term climate fluctuations caused by changes in the global ocean circulation system. Most palaeoceanographic studies focus on the documentation of the behaviour of the Atlantic Meridional Overtu...
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ftawi:oai:epic.awi.de:37042 2023-05-15T14:26:19+02:00 Arctic sea ice variability during the last deglaciation: a biomarker approach Müller, Juliane Stein, Rüdiger 2014-12-13 https://epic.awi.de/id/eprint/37042/ https://hdl.handle.net/10013/epic.44777 unknown American Geophysical Union Müller, J. orcid:0000-0003-0724-4131 and Stein, R. orcid:0000-0002-4453-9564 (2014) Arctic sea ice variability during the last deglaciation: a biomarker approach , AGU Fall Meeting, San Francisco, CA, USA, 14 December 2014 - 19 December 2014 . hdl:10013/epic.44777 EPIC3AGU Fall Meeting, San Francisco, CA, USA, 2014-12-14-2014-12-19American Geophysical Union Conference notRev 2014 ftawi 2022-10-02T23:12:33Z The last transition from full glacial to current interglacial conditions was accompanied by distinct short-term climate fluctuations caused by changes in the global ocean circulation system. Most palaeoceanographic studies focus on the documentation of the behaviour of the Atlantic Meridional Overturning Circulation (AMOC) during the last deglaciation in response to freshwater forcing events. In this respect, the role of Arctic sea ice remained relatively unconsidered - primarily because of the difficulty of its reconstruction. Here we present new proxy data on late glacial (including the Last Glacial Maximum; LGM) and deglacial sea ice variability in the Arctic Ocean and its main gateway - the Fram Strait - and how these changes in sea ice coverage contributed to AMOC perturbations observed during Heinrich Event 1 and the Younger Dryas. Recurrent short-term advances and retreats of sea ice in Fram Strait, prior and during the LGM, are in line with a variable (or intermittent) North Atlantic heat flow along the eastern corridor of the Nordic Seas. Possibly in direct response to the initial freshwater discharge from melting continental ice-sheets, a permanent sea ice cover established only at about 19 ka BP (i.e. post-LGM) and lasted until 17.6 ka BP, when an abrupt break-up of this thick ice cover and a sudden discharge of huge amounts of sea ice and icebergs through Fram Strait coincided with the weakening of the AMOC during Heinrich Event 1. Similarly, another sea ice maximum at about 12.8 ka BP is associated with the slowdown of the AMOC during the Younger Dryas. The new data sets clearly highlight the important role of Arctic sea ice for the re-organisation of the oceanographic setting in the North Atlantic during the last deglaciation. Further studies and sensitivity experiments to identify crucial driving (and feedback) mechanisms within the High Latitude ice-ocean-atmosphere system will contribute the understanding of rapid climate changes. Conference Object Arctic Arctic Arctic Ocean Fram Strait Iceberg* Nordic Seas North Atlantic Sea ice Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Arctic Ocean Gateway The ENVELOPE(170.967,170.967,-83.517,-83.517) |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
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description |
The last transition from full glacial to current interglacial conditions was accompanied by distinct short-term climate fluctuations caused by changes in the global ocean circulation system. Most palaeoceanographic studies focus on the documentation of the behaviour of the Atlantic Meridional Overturning Circulation (AMOC) during the last deglaciation in response to freshwater forcing events. In this respect, the role of Arctic sea ice remained relatively unconsidered - primarily because of the difficulty of its reconstruction. Here we present new proxy data on late glacial (including the Last Glacial Maximum; LGM) and deglacial sea ice variability in the Arctic Ocean and its main gateway - the Fram Strait - and how these changes in sea ice coverage contributed to AMOC perturbations observed during Heinrich Event 1 and the Younger Dryas. Recurrent short-term advances and retreats of sea ice in Fram Strait, prior and during the LGM, are in line with a variable (or intermittent) North Atlantic heat flow along the eastern corridor of the Nordic Seas. Possibly in direct response to the initial freshwater discharge from melting continental ice-sheets, a permanent sea ice cover established only at about 19 ka BP (i.e. post-LGM) and lasted until 17.6 ka BP, when an abrupt break-up of this thick ice cover and a sudden discharge of huge amounts of sea ice and icebergs through Fram Strait coincided with the weakening of the AMOC during Heinrich Event 1. Similarly, another sea ice maximum at about 12.8 ka BP is associated with the slowdown of the AMOC during the Younger Dryas. The new data sets clearly highlight the important role of Arctic sea ice for the re-organisation of the oceanographic setting in the North Atlantic during the last deglaciation. Further studies and sensitivity experiments to identify crucial driving (and feedback) mechanisms within the High Latitude ice-ocean-atmosphere system will contribute the understanding of rapid climate changes. |
format |
Conference Object |
author |
Müller, Juliane Stein, Rüdiger |
spellingShingle |
Müller, Juliane Stein, Rüdiger Arctic sea ice variability during the last deglaciation: a biomarker approach |
author_facet |
Müller, Juliane Stein, Rüdiger |
author_sort |
Müller, Juliane |
title |
Arctic sea ice variability during the last deglaciation: a biomarker approach |
title_short |
Arctic sea ice variability during the last deglaciation: a biomarker approach |
title_full |
Arctic sea ice variability during the last deglaciation: a biomarker approach |
title_fullStr |
Arctic sea ice variability during the last deglaciation: a biomarker approach |
title_full_unstemmed |
Arctic sea ice variability during the last deglaciation: a biomarker approach |
title_sort |
arctic sea ice variability during the last deglaciation: a biomarker approach |
publisher |
American Geophysical Union |
publishDate |
2014 |
url |
https://epic.awi.de/id/eprint/37042/ https://hdl.handle.net/10013/epic.44777 |
long_lat |
ENVELOPE(170.967,170.967,-83.517,-83.517) |
geographic |
Arctic Arctic Ocean Gateway The |
geographic_facet |
Arctic Arctic Ocean Gateway The |
genre |
Arctic Arctic Arctic Ocean Fram Strait Iceberg* Nordic Seas North Atlantic Sea ice |
genre_facet |
Arctic Arctic Arctic Ocean Fram Strait Iceberg* Nordic Seas North Atlantic Sea ice |
op_source |
EPIC3AGU Fall Meeting, San Francisco, CA, USA, 2014-12-14-2014-12-19American Geophysical Union |
op_relation |
Müller, J. orcid:0000-0003-0724-4131 and Stein, R. orcid:0000-0002-4453-9564 (2014) Arctic sea ice variability during the last deglaciation: a biomarker approach , AGU Fall Meeting, San Francisco, CA, USA, 14 December 2014 - 19 December 2014 . hdl:10013/epic.44777 |
_version_ |
1766298818529198080 |